This was shot with my old Nikon D80 with a 50mm f1.4 Nikon Prime lens, ISO 2000 with a 1/1250sec shutter speed at f3.5. 

In retrospect, I should have halved the ISO as some detail was lost in the main flame, but given that I shot this handheld with the camera wedged against a tree for stability and I only had seconds to make a decision, I’m pretty pleased with this, and more importantly have learned a lesson for the next time an opportunity like this presents itself!